Improvement in ratchet-braces for metal drills



H. C. HA'R T.

Ratchet Brace for Metal DriHs. N 157 g7 Patentedse mnm:

N. PETERS, PHOTO LITHOGRAPH(R, WASHINGTON. D C.

IMPROVEMENT IN RATCHET- HUBEBT o. HART, OFVUNIONVILLE, odnnnorrour, nssrenon or, ONE-HALF HIS RIGHT TO A. s. UPSON, 0F SAME PLACE.

BRACES FOR METAL DRILLS.

Specification forming part of Letters Patent No. 167,897, dated September 21, 1875 application filed May 20,1875.

To all whom it may concern:

Be it known thatI, HUBERT O. HART, of Unionville, -in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Ratchet- Braces, of which the following is a specification:

My invention consists of the peculiar construction and combination of devices, as hereinafter described.

The invention relates to what may be termed a ratchet-brace, and is also equally adapted to ratchet-drills.

In the accompanying drawing, Figure l'is a side elevation of a brace which embodies my invention. Fig. 2 is a horizontal section of the same on line as x of Fig. l, and Fig. 3 is a view of a detached portion thereof.

The bit-holder A may be of any known style, and the brace proper B of any ordinary kind. Upon the end of the bit-holder A there is a socket, C, so fitted thereon that when left free the bit-holder will readily turn within said socket. Upon one side of the socket 0 there is a slotted extension, (1, within which the end D of the brace B is hung by means of a pin, 7), Fig. 2, so as to form a joint which allows the socket O to swing or turn relatively to the head or end D of the brace B, either to the right or the left, until one corner of the end D strikes against the body of the bit-head A. Upon the sides of the bit-brace B there are two stops, 0 a, hung upon pins so that they may be swung backward, as shown at the upper side of Fig. 2, orforward, as shown at the lower side in said figure. Under the stops 0 0 springs d cl are placed to hold'the stops either forward or backward, as may be desired. In the ratchet end of the bit-holder brating motion of the brace or lever in places where and when it is inconvenient to turn the brace or lever a'complete revolution.

spring-catch e is thrown out so as to leave the head free to revolve in the socket G, as shown in Figs. 1 and 3. If desired to turn the toolholder A left-handed or backward, the righthand stop 0 (the upper one in Fig.1) is thrown backward, as shown, and the brace B turned in the direction indicated by the arrow in Fig. 2, when the joint of the socket and brace D strikes the body of the bit-holder with such force that the friction created thereby will cause the bit-holder A to move with the brace desired to move it) in that direction, when the again yields until stopped by the end of the left-hand stop 0 abutting against the socket, as shown in Fig. 2, when the joint can yield no farther and the corner of the end D cannot advance in that direction far enough to come in contact with the body of the bit-holder A; therefore the bit-holder will remain stationary, and the brace and socket may be moved upon it back to their starting-point. Motion is again imparted to the brace in the direction indicated by the arrow in Fig. 2, and the corner of the end D will again embrace the bitholder and carry it with it, as before described. To reverse the motion of the bit-holder it is only necessary to throw the right-hand stop 0 forward and the left-hand one backward, when a reciprocating motion of the brace will drive the bit-holder in the opposite direction. By throwing both stops 0 0 forward neither corner of the endD can impinge against the bit-holder, and the stops hold the joint of the socket and brace immovable in either direction, when, by throwing the spring-catch into the recess f, the parts are all looked together, so that the brace may be used in the ordinary manner.

I am aware that a ratchet upon a bit-holder and two pawls upon the brace to engage with the teeth of said ratchet are old; but my stoppawls c c are not designed to engage with the bit-holder, but merely to lock the parts when desired, and prevent them from working.

The operation is as follows, to wit: The

yield until the right-hand corner of the end B so far as the brace can be moved (or it is motion of the brace is reversed, and the joint I claim as my invention- 1. In combination with the body of a bit or tool-holder, the socket 0, end D of a brace or lever, and stops 0 c, all operating together substantially as described, and for the purpose set forth.

2. In combination with the body of a toolholder, the socket O, recess f, and springcatch e, all substantially as described, and for the purpose set forth.

HUBERT O. HART. Witnesses:

H. M. PRESTON, CARLOS L. MASON. 

